Numerical

A transmission wire carries a current of 100 A. What would be the magnetic field B at a point on the road if the wire is 8 m above the road?

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#### Solution

Given:

Magnitude of current, I = 100 A

Separation of the road from the wire, d = 8 m

Thus, the magnetic field is given by

\[= \frac{2 \times {10}^{- 7} \times 20}{0 . 8 \times {10}^{- 3}} = 5\] mT

Is there an error in this question or solution?

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